ALTER TABLE notifications_notificationpreference DROP CONSTRAINT IF EXISTS uq_notif_pref_user;
ALTER TABLE subscriptions_usersubscription DROP CONSTRAINT IF EXISTS uq_subscription_user;
ALTER TABLE notifications_notification DROP CONSTRAINT IF EXISTS chk_notification_sent_consistency;
ALTER TABLE subscriptions_usersubscription DROP CONSTRAINT IF EXISTS chk_subscription_tier;
ALTER TABLE task_task DROP CONSTRAINT IF EXISTS chk_task_not_cancelled_and_archived;